This is the coolest. I know Mr. Gordon would get a kick out of this as well.

This light would be nifty.

[Via]

This lock is activated by the pattern of knocking on a door. It’s very particular about the style of knock. Good idea in theory. Bad idea for sloppy drunk nights when you are returning home and don’t remember where your pants are (Maybe remembering a knock combination is the least of your concerns if you can’t find your pants).